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4561RE: [ccd-newastro] Re: ST7E and G-11

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  • Ron Wodaski
    Dec 1, 2001
      For the G-11 with Gemini goto, the 3-amp Radio Shack, or any 5-amp
      regulated, power supply would be best.

      Ron Wodaski
      The New CCD Astronomy

      -----Original Message-----
      From: John Smith [mailto:johnzonie@...]
      Sent: Saturday, December 01, 2001 9:47 AM
      To: ccd-newastro@yahoogroups.com
      Subject: [ccd-newastro] Re: ST7E and G-11

      In addition to Ron's comments, the SBIG relay box uses reed relays;
      the circuit referenced uses opto-couplers. Both are equally
      effective in isolating the G-11 from the camera. BTW, for AC
      operation, I used a 12v 1 A power supply (wall brick) from Radio
      Shack for the mount.


      --- In ccd-newastro@y..., "Jim Rucker" <yvonnejim@a...> wrote:
      > --- In ccd-newastro@y..., "John Smith" <johnzonie@e...> wrote:
      > > Hi Jim,
      > >
      > > Depending on power systems and grounding, you may run into a
      > > with guiding a G-11 with the ST-7E. Most often, an isolation
      > > is needed. I built the circuit described at
      > >
      > > http://www.mindspring.com/~dlakey/Optical-Isolation-Circuit.html
      > >
      > > and had good luck using it with my ST-8E. Alternatively, you
      > > need to purchase SBIG's relay box.
      > >
      > > Some folks have burned out a chip or two in the G-11 due to
      > > inconsistent grounding. Losmandy gets a fortune for the board,
      > > although if you are handy, you can change out the chup yourself.
      > >
      > > Best bet - use an isolation circuit!
      > >
      > > HTH,
      > HTH
      > Thanks, will the relay box from SBIG be as good as an isolation
      > or is the relay box the same thing.
      > Jim

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